CN211342872U - High-efficiency sealing and grouting layered water-stop device and its well pipe - Google Patents

Abstract

A high-efficiency isolation and grouting layered water-stop device and its well pipe, including well pipe, grouting device and isolation device, the well pipe includes a solid pipe and a water filter pipe, and the grouting device includes a mud pump, a grouting conduit and an injection pipe. Slurry pipe, the packing device includes high-pressure gas cylinder, decompression gauge, high-pressure gas line A, upper packer, high-pressure gas line B and lower packer, the grouting conduit extends into the inner cavity of the well pipe, and the upper end of the grouting conduit is connected to the mud The pump, the lower end of the grouting conduit is connected to the central pipe of the upper packer, the central pipe of the upper packer and the central pipe of the lower packer are communicated through the grouting pipe, the lower end of the lower packer is connected to the bottom plug, and a slurry outlet is opened on the solid pipe , the grouting pipe corresponds to the grouting hole, and the grouting pipe is provided with a grouting outlet. The rubber cylinder cavity of the upper packer and the rubber cylinder cavity of the lower packer are connected in series through the high-pressure gas pipeline B, and the upper packer is sealed. A high-pressure gas line A is connected to the top of the rubber cylinder cavity of the device. The inlet end of the high-pressure gas line A is connected to a pressure reducing gauge, and the pressure reducing gauge is connected to a high-pressure gas cylinder. A check valve is installed on the solid pipe at the position corresponding to the slurry outlet.

Description

High-efficiency sealing and grouting layered water-stop device and its well pipe

technical field

The utility model relates to the technical field of hydrogeological survey and exploration, in particular to a high-efficiency sealing and grouting layered water-stop device and a well pipe thereof.

Background technique

In the hydrogeological survey and groundwater survey, in order to find out the distribution characteristics, water-rich, salinity and other hydrogeological parameters of the aquifers that are meaningful for groundwater development and utilization, it is very important to conduct layered pumping tests for each aquifer. As the premise of the layered water pumping test, a complete set of processes is required to achieve safe and efficient construction.

Packing and grouting layered water-stop technology is to run the grouting conduit and double packers after drilling, running down the pipe, filling the whole hole with gravel, and flushing the well, and run the pre-drilled well at the position where the water stop is required. The pipe is used as the grouting pipe, and the grouting pipe is aligned with the preset grouting pipe to start the packer, and the slurry pump is used to inject the cement slurry into the annular gravel in the water-stop section through the grouting pipe.

In this method, after the grouting is completed, it is necessary to add water to the grouting pipe and pay attention to the change of the water level at all times, maintain the pressure, and prevent the injected cement slurry from flowing back. Clean the equipment in time after grouting. After the cement slurry to be injected is initially set, the packer is proposed or the position of the packer is adjusted for the next stage of grouting to stop water. The environment varies greatly, and the initial setting time of the cement slurry is still difficult to grasp. If the drilling is lifted too early, the cement slurry has a short solidification time and insufficient strength, which may cause the cement slurry to flow back to the well pipe, which may seriously affect the water stop of the layered well. Effect; if the drill is lifted too late, the packer may be stuck in the well pipe, causing equipment damage or affecting the quality of the well. The equipment should be cleaned in time after grouting, and it will be difficult to clean the equipment if the drill is lifted too late.

Utility model content

The purpose of the utility model is to provide a high-efficiency sealing and grouting layered water-stop device and its well pipe, which can prevent the backflow of cement slurry after grouting, avoid the occurrence of drilling accidents, reduce construction steps, and improve work efficiency.

In order to achieve the above object, the utility model adopts the following technical solutions:

A high-efficiency sealing and grouting layered water-stopping device includes a well pipe, a grouting device and a sealing device, the well pipe includes a solid pipe and a water filter pipe, and the grouting device includes a mud pump, a grouting conduit and a grouting device. The packing device includes a high-pressure gas cylinder, a decompression gauge, a high-pressure gas line A, an upper packer, a high-pressure gas line B and a lower packer, the grouting conduit extends into the inner cavity of the well pipe, and the injection The upper end of the slurry conduit is connected to the mud pump, the lower end of the grouting conduit is connected to the central pipe of the upper packer, and the central pipe of the upper packer is communicated with the central pipe of the lower packer through the grouting pipe. The lower end of the packer is connected to the bottom plug, the rubber cylinder cavity of the upper packer and the rubber cylinder cavity of the lower packer are connected in series through the high-pressure gas pipeline B, and the rubber cylinder cavity of the upper packer is connected in series through the high-pressure gas pipeline B. The top is connected with a high-pressure gas pipeline A, the inlet end of the high-pressure gas pipeline A is connected to a decompression gauge, the decompression gauge is connected to a high-pressure gas cylinder, and a slurry hole is opened on the solid pipe. A check valve is installed on the outer wall of the solid pipe at the slurry outlet. The check valve includes a valve seat, a valve core, an elastic part, and a protective cover. On the outer wall of the solid pipe and the corresponding slurry hole, the valve seat is connected with a protective cover, the inner bottom wall of the protective cover is provided with a guide tube, the outer wall of the protective cover is provided with slurry holes, and the valve core includes a circular A table-shaped valve and a guide rod connected to the bottom end of the valve, the valve is correspondingly matched with the slurry feeding hole of the valve seat, the free end of the guide rod is inserted into the guide pipe, and the elastic piece is sleeved on the guide rod and the guide pipe, One end of the elastic piece abuts against the inner end face of the valve, and the other end of the elastic piece abuts against the inner bottom wall of the protective cover.

Preferably, the cylindrical body and the bottom of the protective cover are arc-shaped transitions.

Preferably, the inner wall of the protective cover is connected with the outer wall of the valve seat through a screw thread.

Preferably, the guide rod is stepped; the guide rod includes a large-diameter section connected to the bottom of the valve and a small-diameter section inserted into the guide tube, and the outer diameter of the large-diameter section of the guide rod is the same as that of the guide tube.

Preferably, the lower end of the grouting conduit is connected to the short joint of the upper packer, the lower end of the central pipe of the upper packer is connected to the upper end of the grouting pipe, and the lower end of the grouting pipe is connected to the short joint of the lower packer The lower end opening of the central pipe of the lower packer is connected to the bottom plug.

Preferably, a high-pressure rubber hose is connected between the mud pump and the grouting conduit.

A well pipe, the well pipe comprises a solid pipe and a water filter pipe, a slurry outlet hole is set on the solid pipe, a check valve is installed on the outer wall of the solid pipe at the slurry outlet hole, and the check valve comprises a valve seat, a valve core , elastic piece, protective cover, the valve seat is provided with a circular cone-shaped slurry inlet hole, one end surface of the valve seat is attached to the outer wall surface of the solid pipe and corresponds to the slurry outlet hole, the valve seat is connected with the protective cover, the protective cover The inner bottom wall of the cover is provided with a guide tube, the outer wall of the protective cover is provided with a slurry outlet hole, the valve core includes a circular truncated valve and a guide rod connected to the bottom end of the valve, and the valve is matched with the slurry inlet hole of the valve seat. , the free end of the guide rod is inserted into the guide tube, the elastic piece is sleeved on the guide rod and the guide tube, one end of the elastic piece is pressed against the inner end face of the valve, and the other end of the elastic piece is pressed against the protective cover on the inner bottom wall.

The beneficial effects of the present utility model:

1) After sealing and grouting, there is no need to maintain the pressure to prevent the backflow of the cement slurry, which reduces the construction steps, and there is no need to wait for the initial setting time of the cement slurry for 2-3 hours. Drilling and cleaning equipment accelerates the construction speed and avoids the occurrence of drilling accidents;

2) After grouting and water-stopping, the hole can be cleaned in time to clean up the residual cement slurry on the inner wall of the well pipe, so as to ensure the smooth running of the equipment in the subsequent operation;

3) Each component of the utility model is independent, with good flexibility, simple structure, convenient and quick assembly and installation, and the body and bottom of the check valve are arc-shaped transition, which is convenient for pipe down and gravel filling.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a partial enlarged view of the present utility model.

3 is a schematic structural diagram of the check valve of the present invention.

FIG. 4 is a schematic structural diagram of the valve seat of the check valve.

FIG. 5 is a schematic structural diagram of the valve core of the check valve.

FIG. 6 is a schematic top view of the structure of the protective cover of the check valve.

FIG. 7 is a schematic view of the front structure of the protective cover.

1: well pipe, 11: solid pipe, 12: water filter pipe, 13: check valve, 131: valve seat, 132: slurry inlet, 133: valve core, 134: valve, 135: guide rod, 136: elastic part , 137: protective cover, 138: guide pipe, 139: grout hole, 21: water barrier, 22: aquifer, 31: mud pump, 32: grouting pipe, 33: grouting pipe, 34: high pressure hose, 41: High pressure gas cylinder, 42: Decompression gauge, 43: High pressure gas line A, 44: High pressure gas line B, 45: Upper packer, 46: Lower packer, 47: Bottom plug.

Detailed ways

As shown in Figures 1 and 2, a layered grouting water-stop device for double packers of the present invention includes a well pipe, a grouting device and a packing device, and the well pipe includes a solid pipe 11 and a water filter pipe 12. The solid pipe 11 corresponds to the aquifer 21, the filter pipe corresponds to the aquifer 22 to be pumped, the grouting device includes a mud pump 31, a grouting conduit 32 and a grouting pipe 33, and the isolation device includes a high-pressure gas cylinder 41. Decompression gauge 42, high pressure gas pipeline A43, upper packer 44, high pressure gas pipeline B44 and lower packer 46, the grouting conduit 32 extends into the inner cavity of the well pipe 1, the grouting conduit 32 is The upper end is connected to the mud pump 31 , the lower end of the grouting conduit 32 is connected to the short joint of the upper packer 44 , and the lower end of the center pipe of the upper packer 44 and the short joint of the lower packer 46 are connected to the grouting Pipe 33, the lower end of the central pipe of the lower packer 46 is connected to the bottom plug 47, the rubber cylinder cavity of the upper packer 45 and the rubber cylinder cavity of the lower packer 46 are connected in series through the high pressure gas line B43 , the top of the rubber cylinder cavity of the upper packer 44 is also connected with a high-pressure gas line A44, and the inlet end of the high-pressure gas line A44 is connected to a decompression gauge 42, and the decompression gauge 42 is connected to the high-pressure gas cylinder 41. The slurry pipe 33 corresponds to the slurry outlet hole of the solid pipe, and a check valve 13 is welded on the outer wall of the solid pipe at the slurry outlet hole.

As shown in FIG. 3 to FIG. 7 , the check valve 13 includes a valve seat 131 , a valve core 133 , an elastic member 136 and a protective cover 137 . The end face matches the shape of the outer end wall of the slurry outlet hole of the solid pipe 11 , and the outer end aperture of the slurry inlet hole 132 matches that of the slurry outlet hole of the solid pipe 11 , so that the valve seat 131 and the solid pipe 11 The outer wall is closely fitted, and then the valve seat 131 is fixed on the solid pipe 11 by welding; the outer wall of the valve seat 131 is provided with external threads, and the inner wall of the protective cover 137 is provided with internal threads, so that the valve seat 131 It is connected with the protective cover 137 through a screw thread; the inner bottom wall of the protective cover 137 is provided with a guide tube 138, and the outer wall of the protective cover 137 is provided with a slurry outlet hole 139, and the hole diameter of the hole is slightly smaller than the size of the gravel 10. , so that the gravel cannot enter the protective cover; the valve core 133 includes a circular truncated valve 134 and a guide rod 135 connected to the bottom end of the valve 134; the valve 134 is matched with the slurry inlet hole 132 of the valve seat 131, that is, the valve 134 is located in the slurry inlet hole 132 of the valve seat 131 to move along the slurry inlet hole 132 to realize the opening and closing of the check valve 13; the free end of the guide rod 135 is inserted into the guide tube 138 to keep the valve core along the As the guide tube moves stably in a straight line, the elastic member 136 is sleeved on the guide rod 135 and the guide tube 138. One end of the elastic member 136 is pressed against the inner end surface of the valve 134, and the other end of the elastic member 136 is pressed against the protective cover. 137 on the inner bottom wall.

The check valve 13 is installed in 1-2 rows, and 2 are installed symmetrically in each row, which saves costs. If 2 rows are installed, the distance from the previous row should be about 30cm, and the check valve in the previous row should be installed in a staggered position, which is convenient for gravel filling and Ensure that the cement slurry injected into the gravel layer is evenly distributed.

The cylindrical body and bottom of the protective cover are arc-shaped transitions, which is convenient for downhole pipe and gravel filling.

The guide rod is stepped; the guide rod includes a large-diameter section connected to the bottom of the valve and a small-diameter section inserted into the guide tube, the small-diameter section is inserted in the guide tube, and the outer diameter of the large-diameter section of the guide rod and the guide tube are The outer diameter of the valve is the same to prevent the valve core from over-opening when the pressure is too high, to ensure that the spring deformation does not exceed the elastic limit, and the maximum opening degree of the valve can be changed by adjusting the length of the small diameter section of the guide rod and the depth of the guide tube on the protective cover.

The structure of the upper packer and the lower packer are the same. The packer is in axisymmetric shape, including a short joint, an upper joint, a central pipe, a rubber barrel and a floating head; the short joint and the central pipe are connected by an oil pipe buckle, and the upper joint is sleeved on the outer circumference of the oil pipe buckle; the rubber The cylinder is sleeved in the middle of the central pipe, one end of the rubber cylinder is connected with the upper joint through a thread, the other end of the rubber cylinder is connected with the floating head through a thread, and the floating head is sealedly connected with the central pipe; the upper joint The upper end of the tube is connected with the short joint by an oil pipe buckle, and the lower end is an inner and outer two-layer structure. The surface of the central tube is of a concentric structure; the floating head is also of an inner and outer layer structure, the inner layer is sealedly connected to the central tube, and the outer layer is connected to the bottom end of the rubber cylinder through a screw thread.

For safer and more convenient operation, a high-pressure rubber hose 34 is connected between the mud pump 31 and the grouting conduit 32 .

The well pipe of the water stop device includes a solid pipe 11 and a water filter pipe 12, a slurry outlet hole is set on the solid pipe, and a check valve 13 is installed on the outer wall of the solid pipe at the slurry outlet hole, and the check valve includes a valve seat. , valve core, elastic parts, protective cover, the valve seat is provided with a circular cone-shaped slurry inlet hole, one end surface of the valve seat is attached to the outer wall surface of the solid pipe and corresponds to the slurry outlet hole, the valve seat is connected with the protective cover , the inner bottom wall of the protective cover is provided with a guide pipe, the outer wall of the protective cover is provided with a slurry outlet hole, the valve core includes a circular truncated valve and a guide rod connected to the bottom end of the valve, the valve and the valve seat are slurried The holes are correspondingly matched, the free end of the guide rod is inserted into the guide tube, the elastic piece is sleeved on the guide rod and the guide tube, one end of the elastic piece is pressed against the inner end face of the valve, and the other end of the elastic piece is pressed against the inner end surface of the valve. on the inner bottom wall of the protective cover.

The water-stopping method using the high-efficiency sealing and grouting layered water-stopping device is introduced below. Under the condition of ensuring the safety of the equipment, first open the high-pressure gas cylinder 41, so that the high-pressure gas is decompressed by the decompression table 42 and then enters the high-pressure gas pipe B43'. Then enter the rubber cylinder cavity of the upper packer 44, the high-pressure air pipe A43 and the rubber cylinder cavity of the lower packer 45 in sequence, so that the upper packer 44 and the lower packer 45 are in the rubber cylinder cavity. After the pressure rises and reaches a sealing pressure value, so that the upper packer 44 and the lower packer 45 are in complete contact with the inner wall of the solid pipe 11 of the well pipe 1; then start the mud pump 31 on the surface to inject water , If the clean water can be circulated normally (indicating that the grouting pipe is aligned with the outflow hole of the solid pipe, the clean water can be injected; if the clean water does not circulate normally, it means that the grouting pipe corresponds to the position of the solid pipe, so it cannot be injected into the clean water), then the stirring can be carried out. The good mud is injected into the grouting pipe, and then flows out through the grouting pipe, and is injected into the well pipe through the check valve installed in the solid pipe. The valve core of the check valve moves to open the slurry inlet hole. An annular channel through which the cement slurry flows is formed between the bases, and the slurry is injected out of the well pipe through the slurry hole on the protective cover until all the amount of mud is injected (the volume of the amount of cement slurry is roughly based on the length of the water-stop section and the gravel Under the action of the elastic member, the valve core moves under the action of the spring to close the slurry inlet hole of the valve seat to prevent the injected cement slurry from flowing back into the well pipe, and the grouting is completed. Disconnect the high-pressure gas pipeline and the decompression gauge joint, discharge the high-pressure gas to shrink and unseal the inner cavities of the upper and lower packers, and pull out the grouting device and the packing device located in the inner cavity of the well pipe; The grouting device and the packing device located in the inner cavity of the well tube are cleaned to prevent the cement slurry from solidifying in the device and damaging the equipment.

Preferably, the seating pressure value is 0.6-0.8 MPa, and the air supply pressure of the upper packer and the lower packer is the sum of the water pressure and the seating pressure value that the packer bears.

Preferably, the main components of the cement slurry are cement, water and bentonite, wherein the water-cement ratio is 0.5-0.6, and the bentonite is 3%, so that the slurry has fluidity and meets the water-stop requirement.

The process of the utility model is roughly as follows: after the drilling is completed, the well pipe is installed, the solid pipe of the well pipe corresponds to the required aquifer position, the water screen corresponds to the required aquifer position, and the well pipe is installed. end; carry out full-hole gravel filling and well cleaning, so as to make the surrounding gravel material more compact, and the gravel material will not sink in the later stage; after the equipment can be safely operated after inspection, the water stop device of the present utility model starts to work, and the water stopper is stopped by the mud pump. Cement slurry is injected into the gaps filled with gravel at the water position for layered water-stopping, and the grouting is completed; the equipment in the well is proposed; the water-stopping position is accurate, the water-stopping effect is reliable, and the accident rate of drilling layered wells can be effectively reduced. Provide technical support for efficient and rapid well formation of layered hydrogeological pores.

Claims (7)

1. a high-efficiency isolation grouting layered water-stop device, is characterized in that: it comprises well pipe, grouting device and packing device, this well pipe comprises solid pipe and water filter pipe, this grouting device comprises mud pump, Grouting conduit and grouting pipe, the packing device includes a high-pressure gas cylinder, a decompression gauge, a high-pressure gas line A, an upper packer, a high-pressure gas line B and a lower packer, and the grouting conduit extends into the well pipe The upper end of the grouting conduit is connected to the mud pump, the lower end of the grouting conduit is connected to the central pipe of the upper packer, and the central pipe of the upper packer and the central pipe of the lower packer pass through grouting The lower end of the lower packer is connected to the bottom plug, the rubber cylinder cavity of the upper packer and the rubber cylinder cavity of the lower packer are connected in series through the high-pressure gas pipeline B, and the upper packer is connected in series with the rubber cylinder cavity of the lower packer. The top of the rubber cylinder cavity is connected with a high-pressure gas line A, and the inlet end of the high-pressure gas line A is connected to a decompression gauge, the decompression gauge is connected to a high-pressure gas cylinder, and a slurry hole is opened on the solid pipe. There should be a slurry hole, and a check valve is installed on the outer wall of the solid pipe at the slurry hole. The check valve includes a valve seat, a valve core, an elastic part, and a protective cover. The valve seat is provided with a circular cone-shaped slurry inlet hole. The valve One end of the seat is attached to the outer wall of the solid pipe and corresponds to the slurry outlet. The valve seat is connected to the protective cover. The inner bottom wall of the protective cover is provided with a guide tube, and the outer wall of the protective cover is provided with slurry holes. , the valve core includes a circular truncated valve and a guide rod connected to the bottom end of the valve, the valve is matched with the slurry inlet hole of the valve seat, the free end of the guide rod is inserted into the guide tube, and the elastic piece is sleeved on the guide On the rod and the guide tube, one end of the elastic piece abuts against the inner end face of the valve, and the other end of the elastic piece abuts against the inner bottom wall of the protective cover. 2 . The high-efficiency sealing and grouting layered water-stopping device according to claim 1 , wherein the cylindrical body and the bottom of the protective cover are arc-shaped transitions. 3 . 3 . The high-efficiency isolation grouting layered water-stop device according to claim 1 , wherein the inner wall of the protective cover is connected to the outer wall of the valve seat through a screw thread. 4 . 4. The high-efficiency isolation grouting layered water-stop device according to claim 1, characterized in that: the guide rod is stepped; the guide rod comprises a large-diameter section connected with the bottom of the valve and a small-diameter section inserted into the guide pipe , the outer diameter of the large diameter section of the guide rod is the same as the outer diameter of the guide tube. 5 . The high-efficiency grouting and water-stopping device for high-efficiency isolation according to claim 1 , wherein the lower end of the grouting conduit is connected to the short joint of the upper packer, and the central pipe of the upper The lower end is connected to the upper end of the grouting pipe, the lower end of the grouting pipe is connected to the short joint of the lower packer, and the lower end opening of the central pipe of the lower packer is connected to the bottom plug. 6 . The high-efficiency sealing and grouting layered water-stop device according to claim 1 or 2 , wherein a high-pressure rubber hose is connected between the mud pump and the grouting conduit. 7 . 7. A well pipe comprising a solid pipe and a water filter pipe, characterized in that: a slurry outlet hole is provided on the solid pipe, a check valve is installed on the outer wall of the solid pipe at the slurry outlet hole, and the check valve is It includes a valve seat, a valve core, an elastic piece and a protective cover. The valve seat is provided with a circular truncated slurry inlet hole. One end of the valve seat is attached to the outer wall of the solid pipe and corresponds to the slurry outlet hole. The protective cover is connected, the inner bottom wall of the protective cover is provided with a guide tube, the outer wall of the protective cover is provided with a slurry hole, the valve core includes a circular truncated valve and a guide rod connected to the bottom end of the valve, the valve and the valve seat The feeding holes of the valve are matched correspondingly, the free end of the guide rod is inserted into the guide tube, the elastic piece is sleeved on the guide rod and the guide tube, one end of the elastic piece abuts on the inner end face of the valve, and the other end of the elastic piece Abut against the inner bottom wall of the protective cover.

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